Abstract: Objective: To analyze the imaging character and improve understanding and preoperative imaging diagnostic level of parosteal lipoma. Method: Two cases of pathologically proved parosteal lipoma were analyzed, and the image and clinical features were also reviewed. Results: Of 2 cases parosteal lipoma, men and women were each 1 one, One was located in the soft tissue of superior segment of right femur and one located in lower segment of left tibia respectively. The X-ray image showed the radiolucent parosteal phyma. The fat density oi' fat signal was shown on CT and MR1 image, and capsule oval lobulated phyma was also shown, the border of which was distinct. The coraline or arborization bony protuberance to the inner side of lipoma was formed by the adjacent cortical bone. Conclusions: It is the image feature of parosteal lipoma that the oval fatty phyma coupled with coraline or arborization bony protuberance to the inner side of lipoma originated in the bony cortex, which is of important diagnostic value.